D. Moens¹, M. De Munck, D. Vandepitte

CMES-Computer Modeling in Engineering & Sciences, Vol.22, No.2, pp. 129-150, 2007, DOI:10.3970/cmes.2007.022.129

Abstract Recently, an interval finite element methodology has been developed to calculate envelope frequency response functions of uncertain structures with interval parameters. The methodology is based on a hybrid interval implementation of the modal superposition principle. This hybrid procedure consists of a preliminary optimization step, followed by an interval arithmetic procedure. The final envelope frequency response functions have been proved to give a very good approximation of the actual response range of the interval problem. Initially, this method was developed for undamped structures. Based on the theoretical principles of this approach, this paper introduces a new… More >

W.H. Chen¹, H.C. Cheng², Y.C. Hsu³

CMES-Computer Modeling in Engineering & Sciences, Vol.20, No.2, pp. 123-146, 2007, DOI:10.3970/cmes.2007.020.123

Abstract The evaluation of the fundamental mechanical properties of single/multi-walled carbon nanotubes(S/MWCNTs) is of great importance for their industrial applications. The present work is thus devoted to the determination of various mechanical properties of S/MWCNTs using molecular dynamics (MD) simulations. The study first focuses on the exploration of the effect of the weak inlayer van der Waals (vdW) atomistic interactions on the mechanical properties of S/MWCNTs. Secondly, in addition to the zig-zag and armchair types of CNTs, the hybrid type of MWCNTs that comprise a zig-zag outer tube and an inner armchair tube is also analyzed.… More >

A. Arockiarajan¹, A. Menzel²

CMES-Computer Modeling in Engineering & Sciences, Vol.20, No.1, pp. 55-72, 2007, DOI:10.3970/cmes.2007.020.055

Abstract To study rate-dependent properties of piezoelectric materials a micro-mechanically motivated model is applied in this work. The developed framework is embedded into a coupled three-dimensional finite element setting, whereby each element is assumed to represent one grain and, moreover, possesses a random initialisation of the underlying polarisation direction. Furthermore, an energy-based criterion is used for the initiation of the onset of domain switching and the subsequent propagation of domain wall motion during the switching process is modelled via a linear kinetics theory. The interaction between individual grains is thereby incorporated by means of a probabilistic More >

A. Arockiarajan¹, A. Menzel²

CMES-Computer Modeling in Engineering & Sciences, Vol.19, No.2, pp. 163-178, 2007, DOI:10.3970/cmes.2007.019.163

Abstract To study rate-dependent properties of piezoelectric materials a micro-mechanically motivated model is applied in this work. The developed framework is embedded into a coupled three-dimensional finite element setting, whereby each element is assumed to represent one grain and, moreover, possesses a random initialisation of the underlying polarisation direction. Furthermore, an energy-based criterion is used for the initiation of the onset of domain switching and the subsequent propagation of domain wall motion during the switching process is modelled via a linear kinetics theory. The interaction between individual grains is thereby incorporated by means of a probabilistic More >

M. Timmel¹, M. Kaliske¹, S. Kolling², R. Mueller³

CMC-Computers, Materials & Continua, Vol.5, No.3, pp. 161-172, 2007, DOI:10.3970/cmc.2007.005.161

Abstract A damage approach based on a material model with microstructural evolution is presented. In contrast to phenomenological constitutive laws, the material response is given by mechanisms at the microscale. At first, a micromechanical substructure is chosen, which represents the overall material behaviour. Then the system is described using a micromechanical model. A geometrical modification of the microstructure is allowed to minimize the total energy. Consequently, the global stiffness is reduced. In this context, thermodynamical considerations are based on configurational forces. With the help of the discussed approach, void growth phenomena of materials, which lead to More >

Allen F. Morey¹, L. Andrew Evans¹, R. Clayton McDonough III², Alyssa M. Park¹, Wade J. Sexton², Joseph W. Basler³, Richard A. Santucci⁴, Christopher L. Amling⁵, Keith J. O’Reilly⁶

Canadian Journal of Urology, Vol.13, No.5, pp. 3250-3254, 2006

Abstract Objectives: We performed the first prospective, randomized, multi-center comparison of overall quality and patient tolerability of polyethylene glycol (PEG) and sodium phosphate (NaP) solution for mechanical bowel preparation prior to urinary diversion surgery.
Methods: Between 2001 and 2003, 36 patients at six institutions underwent major urological reconstructive surgery incorporating small intestine (35 radical cystectomy with urinary diversion and 1 bladder augmentation). Patients were prospectively randomized to receive either oral polyethylene glycol (group 1, n=16) or sodium phosphate (group 2, n=20) for mechanical bowel preparation prior to surgery, according to our multi-institutional IRB-approved protocol. All patients completed… More >

F. X. Hart¹

Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 235-235, 2006, DOI:10.32604/mcb.2006.003.235

Abstract This article has no abstract. More >

B. Li¹, F. Li¹, H-X. Li¹, X-C. Xu¹, M. Szczodry¹, Z-C. Yang¹, J-S. Lin², J. H-C. Wang^{1, *}

Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 225-227, 2006, DOI:10.32604/mcb.2006.003.225

Abstract This article has no abstract. More >

S. Temiyasathit¹, W-J. Tang¹, C. T. Anderson¹, T. P. Stearns¹, C. R. Jacobs¹

Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 215-216, 2006, DOI:10.32604/mcb.2006.003.215

Abstract This article has no abstract. More >

J. M. Taboas¹, R. S. Tuan¹

Molecular & Cellular Biomechanics, Vol.3, No.4, pp. 189-191, 2006, DOI:10.32604/mcb.2006.003.189

Abstract This article has no abstract. More >